"Socket" like Module

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Socket Module

Disclaimer: Roblox does not natively support sockets. This module provides a socket-like interface built on top of Roblox’s RemoteEvents for client-server communication.

Github Repo | Download Socket.rbxm

The “Socket” module provides a simple, event-based interface for client-server communication
in Roblox, similar to socket.io. It wraps around RemoteEvents and offers the following key features:

  • Event Listening: Register event listeners using On, remove them with Off, or listen only once with Once.
  • Event Emission: Use Emit to send events to all clients (from the server) or to the server (from the client). Use EmitTo for targeted messaging (server only).
  • Remote Procedure Calls: The Call method allows a client to call a server function and wait for a response within a timeout.
  • Broadcasting: BroadcastExcept lets the server send an event to all players except one.
  • Latency measurement: The Ping method helps measure client-to-server latency.

Features and Usage Examples

1. Event Listening

Register event callbacks on both sides using On.
Example (client-side):

socket:On("HelloFromServer", function(message)
    print("Client received:", message)
end)

On the server side:

socket:On("HelloFromClient", function(player, message)
    print("Server received from", player.Name, ":", message)
end)

2. Emitting Events

Use Emit to send events.
Example (client emitting to server):

socket:Emit("HelloFromClient", "Hi Server, this is the client!")

On the server, you can broadcast to all clients:

socket:Emit("HelloFromServer", "Welcome to the game!")

For targeted messaging (server only), use EmitTo:

socket:EmitTo(targetPlayer, "TargetedMessage", "Hello from server")

3. Remote Procedure Calls (Call)

Clients can call server functions and await a response:

local serverTime = socket:Call("GetServerTime")
print("Client received server time:", serverTime)

On the server, handle the call like a normal event:

socket:On("GetServerTime", function(player)
    return os.time()  -- Returning the server time
end)

4. Broadcasting with Exception

The server can broadcast an event to all players except one using BroadcastExcept:

socket:BroadcastExcept(player, "StateUpdate", newState)

5. Measuring Latency

Measure the ping from client to server with the Ping method:

local latency = socket:Ping()
print("Client measured latency (seconds):", latency)

Module Overview (Socket.luau)

The Socket module abstracts Roblox RemoteEvents to create a socket-like interface.
It supports:

  • On/Off/Once APIs: For registering and removing callbacks.
  • Emit/EmitTo APIs: To send events both broadly and in a targeted manner.
  • Call API: To perform remote procedure calls with automatic timeout handling.
  • BroadcastExcept API: To send events to all players except a specified one.
  • Ping API: To measure client-server latency.

For more detailed usage, inspect the code on github.

Happy coding!

11 Likes
2

BroadcastExcept would be nice if it used an array of players instead of just 1, overall pretty nice though

3

I agree! I will make it a feature :slight_smile:

4

BroadcastExcept now supports an array of players as well as a single player!

1 Like
5

Added room management functions to Socket: JoinRoom, LeaveRoom, and BroadcastToRoom (server only)

6

Added middleware support for logging incoming and outgoing events in Socket, also Socket.new supports an identifier, an existing RemoteEvent or nil (for backwards compatibility)

Exemple:

socket:UseOutgoing(function(direction, eventName, args)
    print("[Middleware - Outgoing]", eventName, unpack(args))
    return eventName, args  -- Optionally transform or filter
end)

socket:UseIncoming(function(direction, eventName, args)
    print("[Middleware - Incoming]", eventName, unpack(args))
    return eventName, args
end)

Release page

1 Like
7

Added ScheduledBroadcast feature to Socket module and update tests. Also added error codes.

The ScheduleBroadcast method allows the server to schedule a broadcast to all clients after a specified delay.

Server Example:

socket:ScheduleBroadcast(10, "EventName", "This message will be broadcasted after 10 seconds.")

Client Example:

Clients can listen for the scheduled broadcast:

socket:On("EventName", function(message)
    print("Received scheduled message:", message)
end)
8

May you add support for unreliable events as well? Thanks

1 Like
9

I’ll try to add this today, its a big task so I will probably release it under beta or untested release. Thank you for suggesting.

10

Added Parallel Socket Operations and Unreliable Events on v0.1.0, its a Pre-release so expect bugs!